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Method and an apparatus for controlling an electric switching device

a technology of electric switching device and apparatus, applied in the direction of electrical apparatus, emergency protective arrangement for automatic disconnection, air-break switch, etc., can solve the problem of longer electric life time or higher performan

Inactive Publication Date: 2007-01-23
ABB GROUP SERVICES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables faster and more controlled current breaking, reducing equipment damage and diode costs by minimizing arc energy and allowing earlier intervention during 'short half waves', while ensuring safety against premature breaking.

Problems solved by technology

The lower arc energy results in a longer electric life time or higher performance.

Method used

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  • Method and an apparatus for controlling an electric switching device
  • Method and an apparatus for controlling an electric switching device
  • Method and an apparatus for controlling an electric switching device

Examples

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Embodiment Construction

[0028]The construction and the function of a hybrid breaker of the type described in the Swedish patent application 9904164-2 mentioned above will now first of all be briefly described for making it easier to understand the invention and since the invention has quite particular advantages for exactly such an electric switching device. The description is made while referring to FIGS. 4–6.

[0029]The electric switching device is connected in a current path 2 for being able to rapidly break a current therein by opening it. One such switching device is arranged per phase, so that a three-phase network has three such switching devices on one and the same location. The switching device has an inner cylinder 3, which may be rotated about an axle 4 and has a movable contact part 5. A second cylinder 6 is arranged externally of the cylinder 3 and has four contacts 7–10 arranged along the movement path of the movable part 5 and adapted to form good electric contacts when bearing against the mov...

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PUM

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Abstract

An apparatus for controlling an electric switching device (1) for alternating current arranged in a current path for opening the switching device and for breaking the current in the current path after occurrence of a fault current comprises members (15) adapted to detect the current in the current path and a unit (20) adapted to control the electric switching device to break the current in the current path directly after a half wave of the alternating current having a peak value below a predetermined current limit value, so that the breaking is completed through a zero-crossing of the alternating current terminating a said half wave.

Description

FIELD OF THE INVENTION AND PRIOR ART[0001]The present invention relates to an apparatus for controlling an electric switching device for alternating current arranged in a current path for opening this device for breaking the current in the current path after occurrence of a fault current in the current path as well as a method for such a control.[0002]Such apparatuses and methods are applicable to all types of fields of use of an electric switching device for breaking a current path upon occurrence of fault currents, such as for example in switch gears for electricity supply within the industry or in distribution or transmission networks. When such a fault current occurs, it is important on one hand to open the electric switching device so that the current is broken as soon as possible in order not to damage different types of equipment connected to the current path, but it is on the other absolutely necessary that the alternating current may shift direction, i.e. has a zero-crossin...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01H7/00H01H9/54H01H33/59H01H9/56H01H33/00
CPCH01H9/541H01H9/56H01H33/006
Inventor LARSSON, PERBACKMAN, MAGNUSJONSSON, LARS
Owner ABB GROUP SERVICES CENT
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